Phytoremediation of fluoride-contaminated water by Landoltia punctata.
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2021
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Resumo
Fluorine is released into the water environment naturally or by anthropogenic
activities. Fluorine promotes health benefits at low concentrations, but it promotes
adverse effects ranging from fluorosis to carcinogenic problems at high
concentrations. Although fluorine removal from environment can occur through
processes such as adsorption, reverse osmosis, and electrodialysis, the
phytoremediation emerges as an accessible and environmentally friendly treatment.
This research aimed to study the phytoremediation potential of Landoltia punctata
for treating water contaminated with fluorine ion (fluoride). The central composite
rotatable design was used to assess the effect of three variables in the process: pH
ranging from 5 to 9; phosphate concentration from 0 to 10 mg L−1
; and nitrate
concentration from 0 to 800 mg L−1
. The plants were exposed to a fluoride initial
concentration of 5 mg L-1
in 3L-vessels that also included Clark's solution for a
period of 10 days. Experimentally, removal of up to 21% was observed for the
supplied fluoride. Values of the order of 30% for the removed fluoride mass can be
predicted by the obtained model. Landoltia punctata is a promising candidate for the
phytoremediation of fluoride-contaminated waters.
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Duckweed, Central composite, Design, Phytoextraction
Citação
BRAGA, A. F. Phytoremediation of fluoride-contaminated water by Landoltia punctata. Engenharia Agrícola, Jaboticabal, v. 41, n. 2, p.171-180, mar./abr. 2021. Disponível em: <https://www.scielo.br/j/eagri/a/v8K4Nhc8GpyVTQLgVq7968M/?lang=en>. Acesso em: 29 abr. 2022.